cleaning up group validations

mifosng-provider/src/main/java/org/mifosplatform/infrastructure/configuration/domain/ConfigurationDomainService.java

@@ -39,4 +39,8 @@ public interface ConfigurationDomainService {
 
     Integer retrieveFinancialYearBeginningMonth();
 
+    public Integer retrieveMinAllowedClientsInGroup();
+
+    public Integer retrieveMaxAllowedClientsInGroup();
+
 }

mifosng-provider/src/main/java/org/mifosplatform/infrastructure/configuration/domain/ConfigurationDomainServiceJpa.java

@@ -121,7 +121,6 @@ public class ConfigurationDomainServiceJpa implements ConfigurationDomainService
         return property.getValue();
     }
 
-
     @Override
     public boolean isPasswordForcedResetEnable() {
         final String propertyName = "force-password-reset-days";
@@ -147,9 +146,24 @@ public class ConfigurationDomainServiceJpa implements ConfigurationDomainService
     public Integer retrieveFinancialYearBeginningMonth() {
         final String propertyName = "financial-year-beginning-month";
         final GlobalConfigurationProperty property = this.globalConfigurationRepository.findOneByNameWithNotFoundDetection(propertyName);
-        if(property.isEnabled())
+        if (property.isEnabled()) return property.getValue().intValue();
-        	return property.getValue().intValue();
+        return 1;
-    	return 1;
+    }
+
+    @Override
+    public Integer retrieveMinAllowedClientsInGroup() {
+        final String propertyName = "min-clients-in-group";
+        final GlobalConfigurationProperty property = this.globalConfigurationRepository.findOneByNameWithNotFoundDetection(propertyName);
+        if (property.isEnabled()) { return property.getValue().intValue(); }
+        return null;
+    }
+
+    @Override
+    public Integer retrieveMaxAllowedClientsInGroup() {
+        final String propertyName = "max-clients-in-group";
+        final GlobalConfigurationProperty property = this.globalConfigurationRepository.findOneByNameWithNotFoundDetection(propertyName);
+        if (property.isEnabled()) { return property.getValue().intValue(); }
+        return null;
     }
 
 }

mifosng-provider/src/main/java/org/mifosplatform/portfolio/client/domain/Client.java

@@ -298,7 +298,6 @@ public final class Client extends AbstractPersistable<Long> {
         final List<ApiParameterError> dataValidationErrors = new ArrayList<>();
         validateNameParts(dataValidationErrors);
         validateActivationDate(dataValidationErrors);
-        validateClientsGroupRules(dataValidationErrors);
 
         if (!dataValidationErrors.isEmpty()) { throw new PlatformApiDataValidationException(dataValidationErrors); }
 
@@ -449,7 +448,6 @@ public final class Client extends AbstractPersistable<Long> {
             actualChanges.put(ClientApiConstants.savingsProductIdParamName, newValue);
         }
 
-
         if (command.isChangeInLongParameterNamed(ClientApiConstants.genderIdParamName, genderId())) {
             final Long newValue = command.longValueOfParameterNamed(ClientApiConstants.genderIdParamName);
             actualChanges.put(ClientApiConstants.genderIdParamName, newValue);
@@ -465,7 +463,6 @@ public final class Client extends AbstractPersistable<Long> {
             actualChanges.put(ClientApiConstants.clientClassificationIdParamName, newValue);
         }
 
-
         final String dateFormatAsInput = command.dateFormat();
         final String localeAsInput = command.locale();
 
@@ -490,7 +487,7 @@ public final class Client extends AbstractPersistable<Long> {
             this.dateOfBirth = newValue.toDate();
         }
 
-        if (command.isChangeInLocalDateParameterNamed(ClientApiConstants.submittedOnDateParamName,getSubmittedOnDate())) {
+        if (command.isChangeInLocalDateParameterNamed(ClientApiConstants.submittedOnDateParamName, getSubmittedOnDate())) {
             final String valueAsInput = command.stringValueOfParameterNamed(ClientApiConstants.submittedOnDateParamName);
             actualChanges.put(ClientApiConstants.submittedOnDateParamName, valueAsInput);
             actualChanges.put(ClientApiConstants.dateFormatParamName, dateFormatAsInput);
@@ -507,7 +504,6 @@ public final class Client extends AbstractPersistable<Long> {
         return actualChanges;
     }
 
-   
     private void validateNameParts(final List<ApiParameterError> dataValidationErrors) {
         final DataValidatorBuilder baseDataValidator = new DataValidatorBuilder(dataValidationErrors).resource("client");
 
@@ -572,18 +568,6 @@ public final class Client extends AbstractPersistable<Long> {
         }
     }
 
-    /*
-     * To become a part of a group, group may have set of criteria to be met
-     * before client can become member of it. This method is placeholder for
-     * such validation.
-     */
-
-    private void validateClientsGroupRules(final List<ApiParameterError> dataValidationErrors) {
-        for (Group group : this.groups) {
-            group.validateGroupHasMoreThanRequiredNumberOfClientsAngLogError(dataValidationErrors);
-        }
-    }
-
     private void deriveDisplayName() {
 
         StringBuilder nameBuilder = new StringBuilder();

mifosng-provider/src/main/java/org/mifosplatform/portfolio/client/service/ClientWritePlatformServiceJpaRepositoryImpl.java

@@ -18,6 +18,7 @@ import org.mifosplatform.commands.service.CommandProcessingService;
 import org.mifosplatform.commands.service.CommandWrapperBuilder;
 import org.mifosplatform.infrastructure.codes.domain.CodeValue;
 import org.mifosplatform.infrastructure.codes.domain.CodeValueRepositoryWrapper;
+import org.mifosplatform.infrastructure.configuration.domain.ConfigurationDomainService;
 import org.mifosplatform.infrastructure.core.api.JsonCommand;
 import org.mifosplatform.infrastructure.core.data.CommandProcessingResult;
 import org.mifosplatform.infrastructure.core.data.CommandProcessingResultBuilder;
@@ -42,6 +43,7 @@ import org.mifosplatform.portfolio.client.exception.InvalidClientSavingProductEx
 import org.mifosplatform.portfolio.client.exception.InvalidClientStateTransitionException;
 import org.mifosplatform.portfolio.group.domain.Group;
 import org.mifosplatform.portfolio.group.domain.GroupRepository;
+import org.mifosplatform.portfolio.group.exception.GroupMemberCountNotInPermissibleRangeException;
 import org.mifosplatform.portfolio.group.exception.GroupNotFoundException;
 import org.mifosplatform.portfolio.loanaccount.domain.Loan;
 import org.mifosplatform.portfolio.loanaccount.domain.LoanRepository;
@@ -82,6 +84,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
     private final SavingsProductRepository savingsProductRepository;
     private final SavingsApplicationProcessWritePlatformService savingsApplicationProcessWritePlatformService;
     private final CommandProcessingService commandProcessingService;
+    private final ConfigurationDomainService configurationDomainService;
 
     @Autowired
     public ClientWritePlatformServiceJpaRepositoryImpl(final PlatformSecurityContext context,
@@ -91,7 +94,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
             final CodeValueRepositoryWrapper codeValueRepository, final LoanRepository loanRepository,
             final SavingsAccountRepository savingsRepository, final SavingsProductRepository savingsProductRepository,
             final SavingsApplicationProcessWritePlatformService savingsApplicationProcessWritePlatformService,
-            final CommandProcessingService commandProcessingService) {
+            final CommandProcessingService commandProcessingService, final ConfigurationDomainService configurationDomainService) {
         this.context = context;
         this.clientRepository = clientRepository;
         this.officeRepository = officeRepository;
@@ -106,6 +109,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
         this.savingsProductRepository = savingsProductRepository;
         this.savingsApplicationProcessWritePlatformService = savingsApplicationProcessWritePlatformService;
         this.commandProcessingService = commandProcessingService;
+        this.configurationDomainService = configurationDomainService;
     }
 
     @Transactional
@@ -215,6 +219,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
                     clientType, clientClassification, command);
             boolean rollbackTransaction = false;
             if (newClient.isActive()) {
+                validateParentGroupRulesBeforeClientActivation(newClient);
                 final CommandWrapper commandWrapper = new CommandWrapperBuilder().activateClient(null).build();
                 rollbackTransaction = this.commandProcessingService.validateCommand(commandWrapper, currentUser);
             }
@@ -351,6 +356,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
             this.fromApiJsonDeserializer.validateActivation(command);
 
             final Client client = this.clientRepository.findOneWithNotFoundDetection(clientId);
+            validateParentGroupRulesBeforeClientActivation(client);
 
             final Locale locale = command.extractLocale();
             final DateTimeFormatter fmt = DateTimeFormat.forPattern(command.dateFormat()).withLocale(locale);
@@ -568,4 +574,22 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
                 .build();
     }
 
+    /*
+     * To become a part of a group, group may have set of criteria to be met
+     * before client can become member of it.
+     */
+    private void validateParentGroupRulesBeforeClientActivation(Client client) {
+        Integer minNumberOfClients = configurationDomainService.retrieveMinAllowedClientsInGroup();
+        Integer maxNumberOfClients = configurationDomainService.retrieveMaxAllowedClientsInGroup();
+        for (Group group : client.getGroups()) {
+            /**
+             * Since this Client has not yet been associated with the group,
+             * reduce maxNumberOfClients by 1
+             **/
+            final boolean validationsuccess = group.isGroupsClientCountWithinMaxRange(maxNumberOfClients - 1);
+            if (!validationsuccess) { throw new GroupMemberCountNotInPermissibleRangeException(group.getId(), minNumberOfClients,
+                    maxNumberOfClients); }
+        }
+    }
+
 }

mifosng-provider/src/main/java/org/mifosplatform/portfolio/group/domain/Group.java

@@ -118,18 +118,19 @@ public final class Group extends AbstractPersistable<Long> {
     @JoinColumn(name = "submittedon_userid", nullable = true)
     private AppUser submittedBy;
 
-    //  JPA default constructor for entity
+    // JPA default constructor for entity
     protected Group() {
         this.name = null;
         this.externalId = null;
         this.clientMembers = new HashSet<>();
-        }
+    }
 
     public static Group newGroup(final Office office, final Staff staff, final Group parent, final GroupLevel groupLevel,
             final String name, final String externalId, final boolean active, final LocalDate activationDate,
             final Set<Client> clientMembers, final Set<Group> groupMembers, final LocalDate submittedOnDate, final AppUser currentUser) {
 
-        //  By default new group is created in PENDING status, unless explicitly status is set to active
+        // By default new group is created in PENDING status, unless explicitly
+        // status is set to active
         GroupingTypeStatus status = GroupingTypeStatus.PENDING;
         LocalDate groupActivationDate = null;
         if (active) {
@@ -177,7 +178,8 @@ public final class Group extends AbstractPersistable<Long> {
         associateClients(clientMembers);
 
         /*
-         * Always keep status change at the bottom, as status change rule depends on the attribute's value
+         * Always keep status change at the bottom, as status change rule
+         * depends on the attribute's value
          */
 
         setStatus(activationDate, currentUser, status, dataValidationErrors);
@@ -185,14 +187,12 @@ public final class Group extends AbstractPersistable<Long> {
         throwExceptionIfErrors(dataValidationErrors);
     }
 
-
     private void setStatus(final LocalDate activationDate, final AppUser loginUser, final GroupingTypeStatus status,
             final List<ApiParameterError> dataValidationErrors) {
 
         if (status.isActive()) {
             activate(loginUser, activationDate, dataValidationErrors);
-        }
+        } else {
-        else{
             this.status = status.getValue();
         }
 
@@ -201,8 +201,6 @@ public final class Group extends AbstractPersistable<Long> {
     private void activate(final AppUser currentUser, final LocalDate activationLocalDate, final List<ApiParameterError> dataValidationErrors) {
 
         validateStatusNotEqualToActiveAndLogError(dataValidationErrors);
-        validateRequiredNumberOfClientPerGroupAngLogError(dataValidationErrors);
-        
         if (dataValidationErrors.isEmpty()) {
             this.status = GroupingTypeStatus.ACTIVE.getValue();
             setActivationDate(activationLocalDate.toDate(), currentUser, dataValidationErrors);
@@ -218,7 +216,7 @@ public final class Group extends AbstractPersistable<Long> {
 
     }
 
-    private void setActivationDate(final Date activationDate, final AppUser loginUser, final List<ApiParameterError> dataValidationErrors){
+    private void setActivationDate(final Date activationDate, final AppUser loginUser, final List<ApiParameterError> dataValidationErrors) {
 
         if (activationDate != null) {
             this.activationDate = activationDate;
@@ -238,7 +236,7 @@ public final class Group extends AbstractPersistable<Long> {
     }
 
     public boolean isActive() {
-        return this.status != null ? GroupingTypeStatus.fromInt(this.status).isActive(): false;
+        return this.status != null ? GroupingTypeStatus.fromInt(this.status).isActive() : false;
     }
 
     private boolean isDateInTheFuture(final LocalDate localDate) {
@@ -313,15 +311,6 @@ public final class Group extends AbstractPersistable<Long> {
     }
 
     public List<String> associateClients(final Set<Client> clientMembersSet) {
-
-        final List<ApiParameterError> dataValidationErrors = new ArrayList<>();
-        final List<String> newlyAssociatedClients = associateClients(clientMembersSet, dataValidationErrors);
-        throwExceptionIfErrors(dataValidationErrors);
-        return newlyAssociatedClients;
-        
-    }
-
-    public List<String> associateClients(final Set<Client> clientMembersSet, final List<ApiParameterError> dataValidationErrors) {
         final List<String> differences = new ArrayList<>();
         for (final Client client : clientMembersSet) {
             if (hasClientAsMember(client)) { throw new ClientExistInGroupException(client.getId(), getId()); }
@@ -329,13 +318,6 @@ public final class Group extends AbstractPersistable<Long> {
             differences.add(client.getId().toString());
         }
 
-        /*
-         * Minimum and maximum number of client rule is applicable only for active group
-         */
-        if (isActive()) {
-            validateGroupHasMoreThanRequiredNumberOfClientsAngLogError(dataValidationErrors);
-        }
-        
         return differences;
     }
 
@@ -425,6 +407,10 @@ public final class Group extends AbstractPersistable<Long> {
         return this.groupLevel.isCenter();
     }
 
+    public boolean isGroup() {
+        return this.groupLevel.isGroup();
+    }
+
     public boolean isTransferInProgress() {
         return GroupingTypeStatus.fromInt(this.status).isTransferInProgress();
     }
@@ -512,7 +498,6 @@ public final class Group extends AbstractPersistable<Long> {
                         .getParent().getId(), group.getId());
             }
 
-
             this.groupMembers.add(group);
             differences.add(group.getId().toString());
         }
@@ -535,66 +520,45 @@ public final class Group extends AbstractPersistable<Long> {
         return differences;
     }
 
-    public void validateRequiredNumberOfClientPerGroupAngLogError(final List<ApiParameterError> dataValidationErrors) {
+    public Boolean isGroupsClientCountWithinMinMaxRange(Integer minClients, Integer maxClients) {
 
-        if (!hasGroupRequiredNumberOfClients()) {
+        if (maxClients == null && minClients == null) { return true; }
 
-            // This validation not strictly related to a parameter, that is the
+        // set minClients or maxClients to 0 if null
-            // reason parameterName is set null
 
-            final String parameterName = null;
+        if (minClients == null) {
-            final String globalisationMessageCode = "error.msg.group.activation.without.required.number.of.members";
+            minClients = 0;
-            final String defaultUserMessage = "Group should have number of members between " + this.groupLevel.getMinClients() + " and "
+        }
-                    + this.groupLevel.getMaxClients();
-            final ApiParameterError error = ApiParameterError.parameterError(globalisationMessageCode, defaultUserMessage, parameterName);
 
-            dataValidationErrors.add(error);
+        if (maxClients == null) {
+            maxClients = Integer.MAX_VALUE;
+        }
 
+        Set<Client> activeClientMembers = getActiveClientMembers();
+
+        if (activeClientMembers.size() >= minClients && activeClientMembers.size() <= maxClients) { return true; }
+        return false;
+    }
+
+    public Boolean isGroupsClientCountWithinMaxRange(Integer maxClients) {
+        Set<Client> activeClientMembers = getActiveClientMembers();
+        if (maxClients == null) {
+            return true;
+        } else if (activeClientMembers.size() <= maxClients) {
+            return true;
+        } else {
+            return false;
         }
     }
 
-    private Boolean hasGroupRequiredNumberOfClients() {
+    public Set<Client> getActiveClientMembers() {
-
+        Set<Client> activeClientMembers = new HashSet<>();
-        /*
+        for (Client client : this.clientMembers) {
-         * If maximum clients required per group is set to zero or less then zero
+            if (client.isActive()) {
-         * then irrespective of minimum required number, below condition returns true
+                activeClientMembers.add(client);
-         * that means this is rule is not validated
+            }
-         */
-        
-        if (this.clientMembers.size() >= this.groupLevel.getMinClients()
-                && (this.clientMembers.size() < this.groupLevel.getMaxClients() || this.groupLevel.getMaxClients() <= 0)) { return true; }
-        return false;
-
-    }
-
-    public void validateGroupHasMoreThanRequiredNumberOfClientsAngLogError(final List<ApiParameterError> dataValidationErrors) {
-
-        if (hasGroupMoreThanRequiredNumberOfClients()) {
-
-            // This validation not strictly related to a parameter, that is the
-            // reason parameterName is set null
-
-            final String parameterName = null;
-            final String globalisationMessageCode = "error.msg.group.can.not.have.more.than.required.number.of.members";
-            final String defaultUserMessage = "Group should have number of members between " + this.groupLevel.getMinClients() + " and "
-                    + this.groupLevel.getMaxClients();
-            final ApiParameterError error = ApiParameterError.parameterError(globalisationMessageCode, defaultUserMessage, parameterName);
-
-            dataValidationErrors.add(error);
-
         }
-    }
+        return activeClientMembers;
-
-    private Boolean hasGroupMoreThanRequiredNumberOfClients(){
-        /*
-         * If maximum clients required per group is set to zero or less then zero
-         * then below condition returns always false
-         * that means this is rule is not validated and group can have unlimited number of clients.
-         */
-
-        if (this.clientMembers.size() > this.groupLevel.getMaxClients() && this.groupLevel.getMaxClients() > 0) { return true; }
-        return false;
-        
     }
 
     private void validateActivationDate(final List<ApiParameterError> dataValidationErrors) {
@@ -603,8 +567,8 @@ public final class Group extends AbstractPersistable<Long> {
 
             final String defaultUserMessage = "Submitted on date cannot be in the future.";
             final String globalisationMessageCode = "error.msg.group.submittedOnDate.in.the.future";
-            final ApiParameterError error = ApiParameterError.parameterError(globalisationMessageCode ,
+            final ApiParameterError error = ApiParameterError.parameterError(globalisationMessageCode, defaultUserMessage,
-                    defaultUserMessage, GroupingTypesApiConstants.submittedOnDateParamName, this.submittedOnDate);
+                    GroupingTypesApiConstants.submittedOnDateParamName, this.submittedOnDate);
 
             dataValidationErrors.add(error);
         }
@@ -638,7 +602,7 @@ public final class Group extends AbstractPersistable<Long> {
         }
     }
 
-    private void validateStatusNotEqualToActiveAndLogError(final List<ApiParameterError> dataValidationErrors){
+    private void validateStatusNotEqualToActiveAndLogError(final List<ApiParameterError> dataValidationErrors) {
 
         if (isActive()) {
             final String defaultUserMessage = "Cannot activate group. Group is already active.";

mifosng-provider/src/main/java/org/mifosplatform/portfolio/group/domain/GroupLevel.java

@@ -30,12 +30,6 @@ public class GroupLevel extends AbstractPersistable<Long> {
     @Column(name = "can_have_clients", nullable = false)
     private boolean canHaveClients = false;
 
-    @Column(name = "min_clients", nullable = false)
-    private final Long minClients;
-    
-    @Column(name = "max_clients", nullable = false)
-    private final Long maxClients;
-    
     public GroupLevel() {
 
         this.parentId = null;
@@ -43,22 +37,17 @@ public class GroupLevel extends AbstractPersistable<Long> {
         this.levelName = null;
         this.recursable = false;
         this.canHaveClients = false;
-        this.minClients = null;
-        this.maxClients = null;
 
     }
 
     public GroupLevel(final Long parentId, final boolean isSuperParent, final String levelName, final boolean recursable,
-            final boolean canHaveClients, final Long minClients, final Long maxClients) {
+            final boolean canHaveClients) {
 
         this.superParent = isSuperParent;
         this.parentId = parentId;
         this.levelName = levelName;
         this.recursable = recursable;
         this.canHaveClients = canHaveClients;
-        this.minClients = minClients;
-        this.maxClients = maxClients;
-
     }
 
     public Long getParentId() {
@@ -89,11 +78,8 @@ public class GroupLevel extends AbstractPersistable<Long> {
         return this.levelName.equalsIgnoreCase("Center");
     }
 
-    public Long getMinClients(){
+    public boolean isGroup() {
-        return this.minClients;
+        return this.levelName.equalsIgnoreCase("Group");
     }
 
-    public Long getMaxClients(){
-        return this.maxClients;
-    }
 }

mifosng-provider/src/main/java/org/mifosplatform/portfolio/group/exception/GroupMemberCountNotInPermissibleRangeException.java

@@ -0,0 +1,17 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package org.mifosplatform.portfolio.group.exception;
+
+import org.mifosplatform.infrastructure.core.exception.AbstractPlatformDomainRuleException;
+
+public class GroupMemberCountNotInPermissibleRangeException extends AbstractPlatformDomainRuleException {
+
+    public GroupMemberCountNotInPermissibleRangeException(final Long groupId, final Integer minClients, final Integer maxClients) {
+        super("error.msg.group.members.count.must.be.in.permissible.range", "Number of members in the group with Id " + groupId
+                + " should be between " + minClients + " and " + maxClients, groupId, minClients, maxClients);
+    }
+
+}

mifosng-provider/src/main/java/org/mifosplatform/portfolio/group/service/GroupingTypesWritePlatformServiceJpaRepositoryImpl.java

@@ -19,6 +19,7 @@ import org.mifosplatform.commands.service.CommandProcessingService;
 import org.mifosplatform.commands.service.CommandWrapperBuilder;
 import org.mifosplatform.infrastructure.codes.domain.CodeValue;
 import org.mifosplatform.infrastructure.codes.domain.CodeValueRepositoryWrapper;
+import org.mifosplatform.infrastructure.configuration.domain.ConfigurationDomainService;
 import org.mifosplatform.infrastructure.core.api.JsonCommand;
 import org.mifosplatform.infrastructure.core.data.CommandProcessingResult;
 import org.mifosplatform.infrastructure.core.data.CommandProcessingResultBuilder;
@@ -47,6 +48,7 @@ import org.mifosplatform.portfolio.group.domain.GroupRepositoryWrapper;
 import org.mifosplatform.portfolio.group.domain.GroupTypes;
 import org.mifosplatform.portfolio.group.exception.GroupAccountExistsException;
 import org.mifosplatform.portfolio.group.exception.GroupHasNoStaffException;
+import org.mifosplatform.portfolio.group.exception.GroupMemberCountNotInPermissibleRangeException;
 import org.mifosplatform.portfolio.group.exception.GroupMustBePendingToBeDeletedException;
 import org.mifosplatform.portfolio.group.exception.InvalidGroupLevelException;
 import org.mifosplatform.portfolio.group.exception.InvalidGroupStateTransitionException;
@@ -85,6 +87,7 @@ public class GroupingTypesWritePlatformServiceJpaRepositoryImpl implements Group
     private final SavingsAccountRepository savingsRepository;
     private final CommandProcessingService commandProcessingService;
     private final CalendarInstanceRepository calendarInstanceRepository;
+    private final ConfigurationDomainService configurationDomainService;
 
     @Autowired
     public GroupingTypesWritePlatformServiceJpaRepositoryImpl(final PlatformSecurityContext context,
@@ -93,7 +96,7 @@ public class GroupingTypesWritePlatformServiceJpaRepositoryImpl implements Group
             final GroupLevelRepository groupLevelRepository, final GroupingTypesDataValidator fromApiJsonDeserializer,
             final LoanRepository loanRepository, final SavingsAccountRepository savingsRepository,
             final CodeValueRepositoryWrapper codeValueRepository, final CommandProcessingService commandProcessingService,
-            final CalendarInstanceRepository calendarInstanceRepository) {
+            final CalendarInstanceRepository calendarInstanceRepository, final ConfigurationDomainService configurationDomainService) {
         this.context = context;
         this.groupRepository = groupRepository;
         this.clientRepositoryWrapper = clientRepositoryWrapper;
@@ -107,6 +110,7 @@ public class GroupingTypesWritePlatformServiceJpaRepositoryImpl implements Group
         this.codeValueRepository = codeValueRepository;
         this.commandProcessingService = commandProcessingService;
         this.calendarInstanceRepository = calendarInstanceRepository;
+        this.configurationDomainService = configurationDomainService;
     }
 
     private CommandProcessingResult createGroupingType(final JsonCommand command, final GroupTypes groupingType, final Long centerId) {
@@ -157,6 +161,11 @@ public class GroupingTypesWritePlatformServiceJpaRepositoryImpl implements Group
 
             boolean rollbackTransaction = false;
             if (newGroup.isActive()) {
+                // validate Group creation rules for Group
+                if (newGroup.isGroup()) {
+                    validateGroupRulesBeforeActivation(newGroup);
+                }
+
                 if (newGroup.isCenter()) {
                     final CommandWrapper commandWrapper = new CommandWrapperBuilder().activateCenter(null).build();
                     rollbackTransaction = this.commandProcessingService.validateCommand(commandWrapper, currentUser);
@@ -226,6 +235,10 @@ public class GroupingTypesWritePlatformServiceJpaRepositoryImpl implements Group
 
             final Group group = this.groupRepository.findOneWithNotFoundDetection(groupId);
 
+            if (group.isGroup()) {
+                validateGroupRulesBeforeActivation(group);
+            }
+
             final LocalDate activationDate = command.localDateValueOfParameterNamed("activationDate");
 
             validateOfficeOpeningDateisAfterGroupOrCenterOpeningDate(group.getOffice(), group.getGroupLevel(), activationDate);
@@ -245,6 +258,20 @@ public class GroupingTypesWritePlatformServiceJpaRepositoryImpl implements Group
         }
     }
 
+    private void validateGroupRulesBeforeActivation(final Group group) {
+        Integer minClients = configurationDomainService.retrieveMinAllowedClientsInGroup();
+        Integer maxClients = configurationDomainService.retrieveMaxAllowedClientsInGroup();
+        boolean isGroupClientCountValid = group.isGroupsClientCountWithinMinMaxRange(minClients, maxClients);
+        if (!isGroupClientCountValid) { throw new GroupMemberCountNotInPermissibleRangeException(group.getId(), minClients, maxClients); }
+    }
+
+    public void validateGroupRulesBeforeClientAssociation(final Group group) {
+        Integer minClients = configurationDomainService.retrieveMinAllowedClientsInGroup();
+        Integer maxClients = configurationDomainService.retrieveMaxAllowedClientsInGroup();
+        boolean isGroupClientCountValid = group.isGroupsClientCountWithinMaxRange(maxClients);
+        if (!isGroupClientCountValid) { throw new GroupMemberCountNotInPermissibleRangeException(group.getId(), minClients, maxClients); }
+    }
+
     @Transactional
     @Override
     public CommandProcessingResult updateCenter(final Long centerId, final JsonCommand command) {
@@ -645,6 +672,10 @@ public class GroupingTypesWritePlatformServiceJpaRepositoryImpl implements Group
         final Map<String, Object> actualChanges = new HashMap<>();
 
         final List<String> changes = groupForUpdate.associateClients(clientMembers);
+
+        if (groupForUpdate.isGroup()) {
+            validateGroupRulesBeforeClientAssociation(groupForUpdate);
+        }
         if (!changes.isEmpty()) {
             actualChanges.put(GroupingTypesApiConstants.clientMembersParamName, changes);
         }

mifosng-provider/src/main/resources/sql/migrations/core_db/V208__min_max_clients_in_group_redux.sql

@@ -0,0 +1,9 @@
+INSERT INTO `c_configuration` (`id`, `name`,`value`, `enabled`, `description`) 
+VALUES (NULL, 'min-clients-in-group', '5', '0',"Minimum number of Clients that a Group should have");
+
+INSERT INTO `c_configuration` (`id`, `name`, `value`, `enabled`, `description`)
+VALUES (NULL, 'max-clients-in-group', '5', '0', "Maximum number of Clients that a Group can have");
+
+ALTER TABLE `m_group_level`
+	DROP COLUMN `min_clients`,
+	DROP COLUMN `max_clients`;